1620668 has 12 divisors (see below), whose sum is σ = 3241392. Its totient is φ = 694560.

The previous prime is 1620667. The next prime is 1620677. The reversal of 1620668 is 8660261.

1620668 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 1620668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28913 + ... + 28968.

It is an arithmetic number, because the mean of its divisors is an integer number (270116).

2^1620668 is an apocalyptic number.

It is an amenable number.

1620668 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1620668 is a wasteful number, since it uses less digits than its factorization.

1620668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57892 (or 57890 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 1620668 is about 1273.0545942732. The cubic root of 1620668 is about 117.4621698043.

The spelling of 1620668 in words is "one million, six hundred twenty thousand, six hundred sixty-eight".